U.S. patent number 7,188,829 [Application Number 10/822,659] was granted by the patent office on 2007-03-13 for liquid sealed mount device.
This patent grant is currently assigned to Honda Motor Co., Ltd.. Invention is credited to Tetsuya Miyahara.
United States Patent |
7,188,829 |
Miyahara |
March 13, 2007 |
Liquid sealed mount device
Abstract
A rubber 12 is vulcanized and bonded integrally with an engine
side mounting member 11 and a barrel member 14 for caulking and
fixing a diaphragm 16. A car body side mounting member 13 is formed
by injection molding a resin material on the outer circumference of
the rubber 12. A seal is provided between the barrel member 14 and
the diaphragm 16 by caulking the peripheral edge part of the
diaphragm 16 with the barrel member 14.
Inventors: |
Miyahara; Tetsuya (Saitama,
JP) |
Assignee: |
Honda Motor Co., Ltd. (Tokyo,
JP)
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Family
ID: |
32905992 |
Appl.
No.: |
10/822,659 |
Filed: |
April 13, 2004 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20040201151 A1 |
Oct 14, 2004 |
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Foreign Application Priority Data
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Apr 14, 2003 [JP] |
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P.2003-109427 |
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Current U.S.
Class: |
267/140.13;
267/140.4 |
Current CPC
Class: |
F16F
13/10 (20130101); B29C 45/14 (20130101) |
Current International
Class: |
F16F
5/00 (20060101) |
Field of
Search: |
;267/140.13,140.11,140.3,140.4 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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08-247208 |
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Sep 1996 |
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JP |
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09079310 |
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Mar 1997 |
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JP |
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09-329180 |
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Dec 1997 |
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JP |
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10009331 |
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Jan 1998 |
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JP |
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2000-065119 |
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Mar 2000 |
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JP |
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2001-050331 |
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Feb 2001 |
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JP |
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Primary Examiner: Nguyen; Xuan Lan
Attorney, Agent or Firm: Arent Fox PLLC
Claims
What is claimed is:
1. A liquid sealed mount device comprising: a first mounting
member; a second mounting member made of resin; an elastic material
bridging a gap between the first mounting member and the second
mounting member; a diaphragm for forming a liquid chamber sealing
the liquid together with the elastic material, wherein the
diaphragm comprises a frame member, a main body bonded to and
entirely covering a first surface of the frame member, and a
covering portion bonded to and entirely covering a second surface
of the frame member; a partition wall for partitioning the liquid
chamber into two liquid chambers; and an orifice provided in the
partition wall for communicating the two liquid chambers, wherein
the elastic material is vulcanized and bonded integrally with and
directly contacts the first mounting member and a metallic barrel
member for caulking and fixing the diaphragm, wherein the second
mounting member is formed by injection molding a resin material on
an outer circumference surface of the elastic material, in which a
seal is provided between the metallic barrel member and the
diaphragm by caulking a peripheral edge part of the diaphragm with
the metallic barrel member, wherein the covering portion defines a
seal member which directly engages the metallic barrel member and
the second surface of the frame member, and wherein the partition
wall is supported by the second mounting member via the elastic
material, and caulked and fixed thereto by the metallic barrel
member via the frame member from the opening side thereof.
2. The liquid sealed mount device as set forth in claim 1, wherein
the elastic material is rubber.
3. The liquid sealed mount device as set forth in claim 1, wherein
the elastic material comprises a conical portion, a first barrel
portion extending from an open end of the conical portion, and a
second barrel portion extending from a free end of the first barrel
portion.
4. The liquid sealed mount device as set forth in claim 1, wherein
the partition wall comprises a main body encompassing a
membrane.
5. The liquid sealed mount device as set forth in claim 4, wherein
the membrane of the partition wall closes a through hole defined in
the main body of the partition wall and absorbs variations in
liquid pressure within one of the two liquid chambers.
6. The liquid sealed mount device as set forth in claim 1, wherein
the barrel member is disposed directly between the elastic material
and the covering portion of the diaphragm.
7. The liquid sealed mount device as set forth in claim 1, wherein
an uppermost surface of the diaphragm abuts a lowermost surface of
the partition wall.
8. The liquid sealed mount device as set forth in claim 1, wherein
a lowermost surface of the elastic member is coplanar with a
lowermost surface of the second mounting member.
9. The liquid sealed mount device as set forth in claim 1, wherein
the barrel member includes a flange extending radially inward and
abuttingly contacting a lowermost surface of the covering portion.
Description
BACKGROUND OF THE INVENTION
The present invention relates to a liquid sealed mount device for
mounting a power plant on the car body.
A liquid sealed mount device is well known in which a mounting
portion made of resin to be mounted on the side of a vibration
generating portion such as an engine or a car body is injection
molded in a rubber for damping (e.g., refer to patent document 1
and patent document 2).
[Patent Document 1]
JP-A-8-247208 (pages 3 to 5, FIGS. 1 and 3)
[Patent Document 2]
JP-A-2001-50331 (pages 3 and 4, FIGS. 1 and 2)
Referring to FIGS. 7A and 7B, FIGS. 1 and 3 of patent document 1
will be described below. And referring to FIGS. 8A and 7B, FIGS. 1
and 2 of patent document 2 will be described below.
FIGS. 7A and 7B are cross-sectional views showing the conventional
liquid sealed mount device (conventional example 1) .
In FIG. 7A, a damping device 100 as the liquid sealed mount device
comprises a bolt 101 attached on the engine side, a mounting member
104 including a top plate 102 and a tie arm 103, an elastic body
106 that is vulcanized and bonded on the mounting member 104, a
support cylinder 107 made of resin and disposed to surround the
elastic body 106, a partition member 111 for partitioning a liquid
chamber 108 within the elastic body 106 into two chambers, a
diaphragm 112 disposed outside the partition member 111, and a cap
113 press fit into an opening portion of the support cylinder 107
to fix the partition member 111 and the diaphragm 112.
Referring to FIG. 7B, a way for manufacturing the damping device
100 will be described.
First of all, the mounting member 104 is placed in a mold for
vulcanization to vulcanize the elastic body 106 and bond the
elastic body 106 to the mounting member 104.
Moreover, the elastic body 106 and the mounting member 104 are
positioned within an injection mold, and molten resin material is
injected into the mold, and molded while the support cylinder 107
is bonded with the elastic body 106.
And in the liquid, the partition member 111 and the diaphragm 112
are inserted into the liquid chamber 108 within the elastic body
106 and the support cylinder 107, and lastly the cap 113 is fitted
into the inside of the support cylinder 107.
FIGS. 8A and 8B are cross-sectional views showing the conventional
liquid sealed mount device (conventional example 2).
In FIG. 8A, a damping device 120 as the liquid sealed mount device
comprises a top plate 121 attached on the engine side and a bolt
shank 122 attached on the top plate 121, an elastic body 124 that
is vulcanized and bonded on a lower face of the top plate 121 and a
cylindrical insert fitting 123, an outer cylindrical member 126
disposed on the circumferential side of the insert fitting 123 and
the elastic body 124, a partition member 127 and a diaphragm 128
disposed inside the insert fitting 123, and a lid member 131
disposed outside the diaphragm 128 and caulked and fixed by the
insert fitting 123.
Referring to FIG. 8B, a way for manufacturing the damping device
120 will be described.
First of all, the top plate 121 and the insert fitting 123 are set
within a mold for molding the elastic body.
Then, rubber in molten state is injected into the mold, and the
elastic body 124 is vulcanized and bonded to the top plate 121 and
the insert fitting 123.
Also, the top plate 121, the insert fitting 123 and the elastic
body 124 are set within a mold for molding the outer cylindrical
member. Then, resin in molten state is injected into the mold to
form the outer cylindrical member 126 around the insert fitting
123.
And the partition member 127, the diaphragm 128 and the lid member
131 are inserted into the insert fitting 123, and the lid member
131 is caulked at the lower end portion of the insert fitting
123.
In FIG. 7, the metallic cap 113 is fitted into the opening portion
of the support cylinder 107 made of resin to fix the partition
member 111 and the diaphragm 112, and seal the liquid chamber 108.
Therefore, the bonding strength between the support cylinder 107
and the cap 113 may be lowered due to a variation in press fit of
the cap 113 into the support cylinder 107, a change with the
passage of time, or a temperature variation, resulting in a lower
sealing ability.
Thus, if the lid member 131 is caulked at the lower end portion of
the insert fitting 123, as shown in FIG. 8, the above-mentioned
problem is solved. However, in the technique of FIG. 8, the insert
fitting 123 is extended from the upper to lower portion of the
outer cylindrical member 126, and further to the portion under the
outer cylindrical member 126, resulting in an increased weight of
the damping device 120 as a whole, whereby there is less effect of
reducing the weight by using the outer cylindrical member 126 made
of resin in the damping device 120.
If the existent parts are made lighter, in addition to the use of
resin, the weight of the damping device or the liquid sealed mount
device is further reduced.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a liquid sealed mount
device having a lighter weight.
In order to accomplish the above object, the present invention
provides a liquid sealed mount device comprising a first mounting
member, a second mounting member made of resin, a rubber bridging
the gap between the first mounting member and the second mounting
member, a diaphragm for forming a liquid chamber sealing the liquid
together with the rubber, a partition wall for partitioning the
liquid chamber into two chambers, and an orifice provided in the
partition wall for communicating two liquid chambers, characterized
in that the rubber is vulcanized and bonded integrally with the
first mounting member and a metallic barrel member for caulking and
fixing the diaphragm, and the second mounting member is formed by
injection molding a resin material on the outer circumference of
the rubber, in which a seal is provided between the metallic barrel
member and the diaphragm by caulking the peripheral edge part of
the diaphragm with the metallic barrel member.
Since the second mounting member is formed on the outer
circumference of the rubber by injection molding the resin
material, the partition wall is supported via the rubber by the
second mounting member, and the metallic barrel member is fixed by
caulking the diaphragm alone, whereby the metallic barrel member is
made smaller and lighter. Also, since the metallic barrel member is
vulcanized and bonded integrally with the rubber, the variation in
the bonding strength or sealing ability is suppressed as compared
with the convention member press fit into the resin.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view of a liquid sealed mount device
according to the present invention.
FIGS. 2A and 2B are a first action view showing a way for
manufacturing the liquid sealed mount device according to the
invention.
FIGS. 3A and 3B are a second action view showing a way for
manufacturing the liquid sealed mount device according to the
invention.
FIG. 4 is a cross-sectional view for explaining the injection
molding of a car body side mounting member according to the
invention.
FIGS. 5A and 5B are cross-sectional views for explaining the
caulking of a barrel member according to the invention.
FIG. 6 is a flowchart showing a way for manufacturing the liquid
sealed mount device according to the invention.
FIGS. 7A and 7B are cross-sectional views showing the conventional
liquid sealed mount device (conventional example 1).
FIGS. 8A and 8B are cross-sectional views showing the conventional
liquid sealed mount device (conventional example 2).
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The preferred embodiments of the present invention will be
described below with reference to the accompanying drawings.
Throughout the figures, the same or like parts are designated by
the same reference numerals.
FIG. 1 is a cross-sectional view of a liquid sealed mount device
according to the invention. The liquid sealed mount device 10
comprises an engine side mounting member 11 made of metal to be
mounted on the engine, a cup-like rubber 12 vulcanized and bonded
to the engine side mounting member 11, a car body side mounting
member 13 made of resin and injection molded in the rubber 12 to be
mounted on the car body, a metallic barrel member 14 having the
rubber 12 vulcanized and bonded, a diaphragm 16 caulked and fixed
by the barrel member 14, a liquid chamber 17 formed by the
diaphragm 16 and the rubber 12, a liquid 18 sealed within the
liquid chamber 17, and a partition wall 23 for partitioning the
liquid chamber 17 into a main liquid chamber. 21 and a secondary
liquid chamber 22.
The engine side mounting member 11 comprises a base portion 26
having the rubber 12 vulcanized and bonded, and a plate-like
portion 27 stood from the base portion 26 to be mounted on the
engine, with a mounting hole 28 opened in the plate-like portion
27.
The rubber 12 comprises a cone-shaped thickened portion 31 serving
as the cup bottom, an upper barrel portion 32 provided integrally
with a lower portion of the thickened portion 31 and having a
larger inner diameter than the thickened portion 31, and a lower
barrel portion 33 provided integrally with a lower portion of the
upper barrel portion 32 and covering the outside of the barrel
member 14.
The car body side mounting member 13 comprises a cylindrical
portion 36 covering a lower portion of the rubber 12, the side
protruding portions 37, 37 extending sideways from the upper
portions of the cylindrical portion 36, and the mounting fittings
38, 38 embedded in the side protruding portions 37, 37.
The diaphragm 16 comprises a cylindrical frame member 41, a
diaphragm main body 42 made of rubber and vulcanized and bonded to
the inside of the frame member 41, and a rubber covering portion 43
vulcanized and bonded to the frame member 41 to cover the
circumferential face of the frame member 41.
The covering portion 43 serves as a seal member between the barrel
member 14 and the diaphragm 16, in which the sealing ability with
the covering portion 43 is increased by caulking the diaphragm 16
with the barrel member 14.
The partition wall 23 comprises a partition wall main body 46, and
a membrane (rubber barrier membrane) 48 provided to close a through
hole 47 opened in the center of the partition wall main body 46.
The main liquid chamber 21 and the secondary liquid chamber 22 are
communicated by forming a spiral orifice 51 in the partition wall
main body 46.
The membrane 48 serves to decrease the dynamic spring constant by
absorbing a variation in the liquid pressure within the main liquid
chamber 21 disposed on the side of the engine side mounting member
11.
Referring to FIGS. 2 to 6, a way for manufacturing the liquid
sealed mount device 10 will be described below.
FIGS. 2A and 2B are first action views showing the way for
manufacturing the liquid sealed mount device according to the
invention.
FIG. 2A shows a state in which the rubber 12 is vulcanized and
bonded to the engine side mounting member 11 and the barrel member
14. This molding is a first intermediate molding 10A.
In FIG. 2B, the first intermediate molding 10A as shown in FIG. 2A
and the mounting fittings 38, 38 are positioned within an injection
mold, and molten resin is injected into the mold to injection mold
the car body side mounting member 13 in the rubber 12. Herein, the
molding is a second intermediate molding 10B. In FIG. 2A, the
barrel member 14 has the rubber 12 vulcanized and bonded, but the
barrel member 14 may be joined with resin in this process.
FIGS. 3A and 3B are second action views showing a way for
manufacturing the liquid sealed mount device according to the
invention.
In FIG. 3A, the second intermediate molding 10B as shown in FIG. 2B
is soaked in the liquid, and the partition wall 23 and the
diaphragm 16 are inserted in succession from the lower side into
the second intermediate molding 10B. Since this operation is
performed in the liquid, the liquid is filled in the molding during
the operation.
And the barrel member 14 is caulked with a small load not to cause
a leakage of liquid from inside the molding. That is, the barrel
member 14 is temporarily caulked. Herein, the molding is a third
intermediate molding 10C.
In FIG. 3B, the third intermediate molding 10C molded in FIG. 3A is
taken out of the liquid, and the barrel member 14 is caulked with a
high load. That is, the barrel member is formally caulked. Thereby,
the liquid sealed mount device 10 is completed. The process as
indicated in FIG. 3B may be made in the liquid after the process as
indicated in FIG. 3A.
FIG. 4 is a cross-sectional view for explaining how to injection
mold the car body side mounting member according to the invention,
and showing a way for producing the molding as shown in FIG.
2B.
First of all, the first intermediate molding 10A and the mounting
fittings 38, 38 are disposed within an injection mold 60. The
injection mold 60 includes an upper part 62 with an inlet port 61
opened, a lower part 63 of cylindrical shape, and a middle part
64.
Molten resin is injected through the inlet port 61 into a cavity
66.
And the second intermediate molding 10B (see FIG. 2B) is taken out
of the injection mold 60 after resin is solidified.
In FIG. 1, since the cylindrical portion 36 of the car body side
mounting member 13 covers the outside of the upper barrel portion
32 and the lower barrel portion 33 for the rubber 12, the partition
wall 23 press fit into the upper barrel portion 32 and the
diaphragm 16 press fit into the lower barrel portion 33 are
securely supported by the cylindrical portion 36.
Accordingly, it is not required that the barrel member 14 is
extended upwards to support the partition wall 23, for example.
Thereby, it is only necessary to support the diaphragm 16 by
reducing the upper and lower sizes of the barrel member 14.
Consequently, the barrel member 14 is made smaller and lighter.
FIGS. 5A and 5B are cross-sectional views for explaining how to
caulk and fix the barrel member according to the invention.
FIG. 5A shows a state immediately after the diaphragm 16 is press
fit into the barrel member 14. To temporarily fix the diaphragm 16
from this state, the barrel member 14 is bent around the entire
circumference of the lower end portion as indicated by the
imaginary line, whereby the diaphragm 16 is temporarily
caulked.
And after temporary caulking, the barrel member 14 is bent almost
at right angles around the entire circumference of the lower end
portion, whereby the diaphragm 16 is formally caulked, as indicated
in FIG. 5B.
The sealing ability between the barrel member 14 and the diaphragm
16 is attained in the resilient covering portion 43 by press
fitting the diaphragm 16 into the barrel member 14 at the first
step, and enhanced by the covering portion 43 by formally caulking
the barrel member 14 at the second step.
FIG. 6 is a flowchart showing a way for manufacturing the liquid
sealed mount device according to the invention. In FIG. 6, STxx
denotes the step number.
ST01 . . Vulcanize and bond the rubber to the engine side mounting
member and the barrel member (thereby producing the first
intermediate molding).
ST02 . . Dispose the first intermediate molding and the mounting
fittings within the injection mold, and injection mold the car body
side mounting member in the rubber (thereby producing the second
intermediate molding).
ST03 . . Press fit the partition wall and the diaphragm in
succession into the second intermediate molding from the lower side
in the liquid, and temporarily caulk the barrel member (thereby
producing the third intermediate molding).
ST04 . . Formally caulk the barrel member (thereby completing the
liquid sealed mount device).
As described above in FIG. 1, with the invention, the car body side
mounting member 13 is vulcanized and molded in the rubber 12,
whereby the partition wall 23 is supported via the rubber 12 by the
car body side mounting member 13. And since it is only required to
caulk and fix the diaphragm 16 in the barrel member 14, the barrel
member 14 is made smaller and lighter.
Though the conventional barrel member has a complex structure, the
barrel member 14 has a simple constitution of barrel in this
invention, whereby the cost is reduced.
Moreover, in the liquid sealed mount device 10 of the invention,
the barrel member 14 is temporarily caulked and then. formally
caulked. Therefore, it is possible to confirm a liquid leakage
after temporarily caulking the barrel member. If liquid leakage is
confirmed at this time, the operation may be interrupted.
Accordingly, in the case where the caulking process for the barrel
member involves caulking alone, in the invention, the number of
wasteful steps is less than when liquid leakage is found after
caulking.
Also, the barrel member 14 has the rubber vulcanized and bonded on
the circumferential face as described above in FIG. 1. However, the
barrel member 14 may have the rubber vulcanized and bonded on both
the inner and outer circumferential faces of the barrel member 14,
or on the inner circumferential face.
The above constitution of the invention has the following
effects.
In the liquid sealed mount device of the invention, the rubber is
vulcanized and bonded integrally with the first mounting member and
the metallic barrel member for caulking and fixing the diaphragm,
and the second mounting member is formed by injection molding a
resin material on the outer circumference of the rubber, in which a
seal is provided between the metallic barrel member and the
diaphragm by caulking the peripheral edge part of the diaphragm
with the metallic barrel member. Therefore, the partition wall is
supported via the rubber by the second mounting member, and the
metallic barrel member is fixed only by caulking the diaphragm
alone, whereby the metallic barrel member is made smaller and
lighter, and the liquid sealed mount device is made lighter.
Also, since the metallic barrel member is vulcanized and bonded
integrally with the rubber, the variation in the bonding strength
or sealing ability is suppressed as compared with the convention
member press fit into the resin.
* * * * *